Following completion of Chapter 21, students should be able to:

1. Explain how a spectrophotometer analyzes samples of water.
2. Perform the following field or laboratory tests—algae counts, calcium, chloride, color, dissolved oxygen, fluoride, iron, manganese, marble test, metals, nitrate, pH, specific conductance, sulfate, taste and odor, trihalomethanes, and total dissolved solids.

The main purpose of this chapter is to teach operators how to accurately analyze samples and properly record laboratory results.

Close